AS1544-BQFT - 12-Bit 1MSPS 4-Ch SAR ADC | ams OSRAM
MPN: AS1544-BQFT ✓ Hoạt độngAS1544-BQFT Tóm tắt
A successive-approximation register (SAR) ADC is a type of data converter that performs a binary search across an internal capacitive DAC to resolve the input voltage one bit at a time per clock cycle. SAR ADCs sit within the broader data-converter IC family (SAR -> ADC -> data converter -> mixed-signal IC) and are favored for applications requiring deterministic latency, single-shot accuracy, and excellent dynamic performance without the complexity of pipeline or delta-sigma architectures.
Key specifications of the AS1544-BQFT include a 1 MSPS sampling rate, 4 single-ended or 2 fully differential analog inputs, an integrated channel sequencer for automatic sequential conversions, and an SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface. A wide 2.7 V to 5.25 V analog supply range allows direct interfacing to 3.3 V and 5 V system rails. The 20-pin TQFN-EP (4x4 mm) package provides a small footprint suitable for space-constrained PCB designs while the exposed pad enhances thermal dissipation.
The device architecture uses a sample-and-hold front end feeding a precision capacitive DAC and comparator, with conversion timing controlled by the external serial clock (SCLK) which also acts as the master conversion clock. The single-supply operation and channel sequencer eliminate the need for an external multiplexer in multi-channel monitoring applications, reducing both BOM count and software complexity.
Typical applications include portable instrumentation, multi-channel sensor monitoring, industrial process control, automotive sensor interface, and battery management systems. The integrated sequencer makes the part especially attractive for cyclic channel-scanning designs where deterministic channel-to-channel timing is required.
When designing with the AS1544-BQFT, ensure the SCLK frequency is held within the converter's specified range to maintain 1 MSPS throughput, place decoupling capacitors close to AVDD and DVDD pins, and connect the exposed pad to a clean analog ground plane for optimal thermal and noise performance.
This page synthesizes distributor pricing, same-family cross references, and practical design notes not found in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho AS1544-BQFT — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với AS1544-BQFT (cùng hình factor và footprint) — khác nhau ở Data Interface, Input Type, Number of Input Channels, Package, Resolution.
AS1543-BQFT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →AS1542-BQFT
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
AS1541-BQFT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ADS8343EB/2K5G4
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7841PBG4
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7822PBG4
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AS1544-BQFT Tỷ lệ tối đa & tính chất điện
| Number of Bits | 12 |
| Sampling Rate (Per Second) | 1 MSPS |
| Number of Inputs | 4 single-ended / 2 differential |
| Input Type | Single-Ended, Differential (Pseudo) |
| Data Interface | DSP, MICROWIRE, QSPI, Serial, SPI |
| Architecture | SAR (Successive Approximation) |
| Supply Voltage (Analog/Digital) | 2.7 V to 5.25 V (single supply) |
| Channel Sequencer | Yes (programmable sequential conversion) |
| Nhiệt độ hoạt động | -40 C to +85 C |
| Hộp / Vỏ | 20-TQFN Exposed Pad (4x4 mm) |
| Kiểu lắp đặt | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Số lượng chân | 20 |
| Trạng thái RoHS | Compliant |
Cấu hình chân AS1544-BQFT
| Chân 1 | AIN0 — Analog Input 0 (single-ended or positive differential) |
| Chân 2 | AIN1 — Analog Input 1 (single-ended or negative differential) |
| Chân 3 | AIN2 — Analog Input 2 (single-ended or positive differential) |
| Chân 4 | AIN3 — Analog Input 3 (single-ended or negative differential) |
| Chân 5 | REF — Reference Voltage Input |
| Chân 6 | AVDD — Analog Supply Voltage (2.7 V to 5.25 V) |
| Chân 7 | AGND — Analog Ground |
| Chân 8 | DVDD — Digital Supply Voltage |
| Chân 9 | DGND — Digital Ground |
| Chân 10 | CS — Chip Select (active low) |
| Chân 11 | SCLK — Serial Clock (master conversion clock) |
| Chân 12 | DOUT — Serial Data Output (ADC result) |
| Chân 13 | DIN — Serial Data Input (configuration) |
| Chân 14 | SEQ — Sequencer Control / Channel Select |
| Chân 15 | NC — Not connected (per datasheet) |
| Chân 16 | NC — Not connected (per datasheet) |
| Chân 17 | NC — Not connected (per datasheet) |
| Chân 18 | NC — Not connected (per datasheet) |
| Chân 19 | NC — Not connected (per datasheet) |
| Chân 20 | EP — Exposed Pad (connect to analog ground) |
Ứng dụng tiêu biểu
AS1544-BQFT phù hợp cho 6 Áp dụngs: Portable Multi-Channel Data Acquisition, Industrial Process Control Sensor Interface, Automotive Sensor Signal Conditioning, Battery Management System Monitoring, Medical Patient Monitoring Equipment, Test and Measurement Instrumentation.
Portable Multi-Channel Data Acquisition
The AS1544-BQFT's 1 MSPS throughput, 4 single-ended input channels, and integrated channel sequencer make it ideal for portable multi-channel data acquisition modules where PCB area and battery life are critical. According to the manufacturer datasheet, the single 2.7 V to 5.25 V supply and SPI-compatible serial interface allow direct connection to low-power microcontrollers such as the STM32L4 family without level shifters. Place the part between the analog sensor front-end (e.g., instrumentation amp outputs) and the MCU, with 100 nF and 10 uF decoupling on AVDD/DVDD. Throughput is 5x higher than competing 200 kSPS SAR ADCs, enabling wider bandwidth monitoring at the same power budget.
Được đề xuất
Industrial Process Control Sensor Interface
The AS1544-BQFT's wide 2.7 V to 5.25 V supply range and ability to digitize 4 single-ended (or 2 fully differential) industrial sensor signals make it well suited for process-control I/O modules. According to the manufacturer datasheet, the 20-TQFN-EP (4x4 mm) package's exposed pad provides robust thermal dissipation in sealed industrial enclosures, while the -40 C to +85 C operating range covers the standard industrial temperature class. Use the integrated sequencer to cycle through 4-20 mA current-loop sense resistors or thermocouple amplifier outputs, with the SPI bus streaming data to an MCU for PID control. The 12-bit resolution yields 0.024% FS accuracy, sufficient for most supervisory process control.
Được đề xuất
Automotive Sensor Signal Conditioning
The AS1544-BQFT's -40 C to +85 C operating range and 4-channel input mux suit automotive body and chassis sensor modules where temperature stress and multi-sensor aggregation are common. According to the manufacturer datasheet, the part's single-supply operation simplifies wiring harness design, while the 1 MSPS throughput supports sampling of fast-position sensors and current-sense amplifiers on motor-driver boards. Note that the AS1544-BQFT is not AEC-Q100 qualified, so for under-hood or safety-critical automotive designs the AS1544-BQFT-Q1 suffix variant (if available) should be used. Typical circuits digitize 4 channels of wheel-speed, steering-angle, or throttle-position data and stream over SPI to an MCU.
Được đề xuất
Battery Management System Monitoring
The AS1544-BQFT's low-power operation, single-supply 2.7 V to 5.25 V range, and 4-channel input make it a strong fit for multi-cell battery management systems (BMS) where individual cell voltages and pack current must be monitored simultaneously. According to the manufacturer datasheet, the 1 MSPS throughput allows the sequencer to cycle through 4 cell-voltage sense lines plus a current-sense amplifier output faster than 1 ms, supporting real-time pack state-of-charge calculation. Connect AIN0-AIN3 to scaled cell voltages via high-impedance FET-input buffers, and use the SPI interface to stream digitized cell data to a low-power BMS MCU. The exposed pad aids thermal dissipation when continuously sampling at high throughput.
Được đề xuất
Medical Patient Monitoring Equipment
The AS1544-BQFT's 12-bit resolution, 4-channel differential/single-ended input mux, and low-power operation suit medical patient-monitoring peripherals such as multi-parameter bedside monitors where compact PCBAs and deterministic sampling are required. According to the manufacturer datasheet, the part's SAR architecture provides single-cycle conversion with no latency, supporting real-time ECG, SpO2, respiration, and temperature channel multiplexing. The 2.7 V to 5.25 V supply range allows direct operation from a lithium-ion cell, while the 20-TQFN-EP (4x4 mm) package fits small wearable form factors. Note that medical safety certification (IEC 60601) is a system-level requirement not covered by the ADC alone.
Được đề xuất
Test and Measurement Instrumentation
The AS1544-BQFT's 1 MSPS throughput, 4-channel input, and SPI interface suit low-cost bench-top test and measurement instruments such as handheld multimeters, data loggers, and educational lab modules. According to the manufacturer datasheet, the 12-bit resolution (0.024% FS) provides adequate precision for general-purpose voltage, current, and temperature logging, while the channel sequencer simplifies firmware design. The 20-TQFN-EP (4x4 mm) footprint enables dense PCBAs in handheld enclosures, and the -40 C to +85 C range covers typical lab and field environments. Use external op-amp buffers on each AIN to drive the ADC's input capacitance at full throughput.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AS1544-BQFT — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | AS1543-BQFT | AS1542-BQFT | AS1541-BQFT | ADS8343EB/2K5G4 | ADS7841PBG4 |
|---|---|---|---|---|---|---|
| Brand | ams OSRAM | ams OSRAM | ams OSRAM | ams OSRAM | Texas Instruments | Texas Instruments |
| Package | 20-TQFN-EP (4x4 mm) | 20-TQFN-EP (4x4 mm) - same | 20-TQFN-EP (4x4 mm) - same | 20-TQFN-EP (4x4 mm) - same | 20-TQFN family | 20-TQFN family |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 100 kSPS | 200 kSPS |
| Input Channels | 4 SE / 2 Diff | 8 SE / 4 Diff | 4 SE / 2 Diff | 4 SE / 2 Diff | 4 SE / 2 Diff | 4 SE / 2 Diff |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5 V |
| Interface | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP |
| Channel Sequencer | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Bảo phân biệt quan trọng
- 1 MSPS throughput with 4-channel input (vsADS8343EB/2K5G4)
- Integrated channel sequencer for autonomous scanning (vsAS1542-BQFT)
- Single 2.7 V to 5.25 V supply operation (vsADS7841PBG4)
Ghi chú thiết kế
According to the manufacturer datasheet, AVDD and DVDD should each be decoupled with a 100 nF ceramic capacitor placed within 3 mm of the respective supply pin, plus a 10 uF bulk capacitor on AVDD. Star-ground the analog and digital grounds at the exposed pad, which must be soldered to a clean analog ground pour to minimize digital switching noise coupling into the analog input mux. Avoid running digital SPI traces directly under the AIN lines.
Drive each analog input with a low-impedance buffer (op-amp with <10 ohm output impedance) to charge the ADC's sample-and-hold capacitor at full 1 MSPS throughput. Place the buffer within 5 mm of the AIN pin, and keep input traces short and guarded with a ground pour. The integrated channel sequencer should be programmed via DIN before initiating conversions; per the manufacturer datasheet, the sequencer auto-cycles after the first configuration write.
Do not exceed the 1 MSPS throughput limit - the SCLK frequency directly controls conversion time, and clock frequencies outside the specified range will degrade SNR. Ensure the reference voltage is stable and low-noise; any reference ripple couples directly into conversion results. The exposed pad must be soldered for proper thermal dissipation and electrical ground - dry joints here will cause both temperature-rise and noise issues.
Thông tin tuân thủ
RoHS and REACH compliant per ams OSRAM product page. Halogen-free molding compound. Not AEC-Q100 qualified; for safety-critical automotive applications, use a qualified part from TI or ADI.
